Saw-sharpening machine.



N9. 881,231. PATBNTED MAR. 10, 1908- m L. L. FILSTRUP.

SAW SHARPBNING MACHINE. APPLIOATION rum) ma. 8, moo.

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m.ss1 ,2s1. I PATENTED MAR.10,1908.

. L. L. FILSTRUR.

SAW SHARPENING MACHINE-Q APPLICATION HLED FEB. a, 1906.

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iillm J No.88l,231. I PATENTBD MAR. 0, 190 L. L. FILSTRUP.

SAW SHARPEN ING MACHINE. APPLIFOATION FILED FEB. 8, 1906.

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- UNITED STATES PATENT oEEroE.

LABS LARSEN FILSTRUP, OF CHICAGO, ILLINOIS, ASSIGNOR TO COVELMANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SAW-SHARPE NING MACHINE Patented March 10, 1908.

Application filed February 8, 1906. Serial No. 300,080.

To all whom it may concern:

Be it known that I, LARs LARSEN FIL- STRUP, a citizen of the UnitedStates of America, and resident of Chicago, Cook county, Illinois, haveinvented a certain new and useful Improvement in Saw-SharpeningMachines, of which the following is a specification.

My invention relates to improvements in saw sharpening machines, isespecially adapted for use in machines for sharpening saws, and relatesparticularly to improved mechanism for automatically feeding the saw incooperation with the other parts of the machine,-that is, relatively tothe grinding wheel or other devices by which the desired operation isperformed on the saw teeth.

The objectof my invention is to provide a feed mechanism which will beosltive and accurate in its action and not liable to get out of order.

A further object is to provide a feed mechanism in which the parts whichare most subject to wear may be easily replaced.

These and such other objects as may more fully appear are attained by myinvention, embodiments of which are illustrated in the accompanyingdrawings, and in which Figure 1 is a front elevation of a saw sharpeningmachine equipped with a feed device embodying the principles of myinvention. Fig. 2 is an enlarged detail front elevation of the feedfinger and attachments. Fig. 3 is a plan view of the devices shown inFig. 2. Fig. 4 is a sectional view on the line A-A of Fig. 2, looking inthe direction indicated by the arrows. Fig. 5 is a sectional view online BB of Fig. 2, looking in the direction indicated by the arrows.Fig. 6 is an enlarged detail plan view of the front end of the feedfinger, showing the feed .pin in position. Fig. 7 is a side elevation ofthe mechanism shown in Fig. 6. Fig. 8 is a sectional view on line C-C ofF ig. 7, looking in the direction indicated by the arrows. Fig. 9 is anend view of the means shown in Fig. 6. Fig. 10 is a perspective view ofthe spring plate for holding the feed in in position. Fig. 11 is anenlarged detail side elevation of a modified form of feed finger. Fig.12 is a plan view of the parts shown in Fig. 11. Fig. 13 is a frontelevation of the means shown in Fig. 11. Fig. 14 is a rear elevation ofthe devices shown in Fig. 11. Fig. 15 is a horizontal sectional view online DD in Fig. 11. Fig. 16 is a vertical sectional view on line EE ofFig. 11. Fig. 17 is an enlarged detail sectional View of Fig. 11,showing the method of securing and adjusting the parts comprising thefeed finger. Fig. 18 is a crosssection on line F-F of Fig. 17. Fig. 19is an enlarged detail sectional view on line GG of Fig. 12. Fig. 20shows how the sharp edge or corner of the feed pin engages in the swageor slight indentation under the front of a tooth.

Like numerals of reference indicate like parts in the several figures ofthe drawing.

1 represents the frame of the machine; 2-2 supports therefor, and 3-3crossbraces.

4 indicates a fragment of a saw held in place against the frame by meansof avertical guide plate and a spring has 5 yieldingly bearing1 againstthe plate. T e saw rests upon t carrying the feed finger 8 is pivoted tothe frame at 9. An adjustable frame 10 for the grinding wheel gate 11,and an adjustable connecting rod 12 to which is ivoted the gate 11carrying the grinding w eel 13, are connected to the rock arm 14 by theconnecting rod 15. A s ring 16 connects the lever 14 with the fee arm 7and holds the rock arm 14 against the cam 17.

Referring now to Figs. 2 to 5, the feed finger 8 is preferably formed intwo piecesa diagonal connecting bar 18 and a horizontal carrying bar19secured together by bolts 2020. The upper end of the arm 7 is providedwith a recess 21 within which is set an adjusting block 22 adapted toplay in the recess between the flanges 2323 of the feed arm. The feedfinger terminates in a circumferential bearing boss 24 provided with anopening through which passes a bolt 25 having a screw end 26 passingthrough a slot 27 in the end of the feed arm 7' in the block 22, andheld in place in any well-known manner, as by a nut 28. On the top ofthe boss 24 is provided an opening 29 in which is seated an oil cup 30.An adjustable bolt 31 extends through the arm 7 and block 22, providingfor a horizontal adjustment of the feed finger. This bolt is providedwith a handle at one end and witha suitable nut 33 and jam nut 33 at theother end. An ade support or guide 6. A feed arm 7 justable bearingblock 34 is secured below to the bottom of the carrying bar 19 of thefeed finger, by means of threaded bolts 35 and 36 and a pair of stopscrews 37-37 extending through the bar. The carrying bar terminates in astop engaging lug 38. A feed pin or bar 39, preferably of hardenedsteel, is seated in a groove in the carrying bar near the end. This pinis held in place by a spring-plate 40 provided with a downwardlyextending flange 40 through which pass the bolts 4'1'. The bolt-hole 42inthe plate is elongated, as Well as thecorrespondinghole in 'the bar,permitting alateral adjustment of the bearing block 34. The end of thebearing block is provided with a horizontal opening in which is mountedthe bearing pin 43; preferably-of hardened steel, adapted to slide on abar 43. This bearingpin is so po sitioned th'atitscenter is in verticalalinement With the contact point of the feed pin. Th'e b'earing-bl'ockis provided with a vertical slot 44 and clampingscrew 45 to clamp saidbearing bar securely into position.

In Figs. 11, etc'., a modification is shown in which the guide 45inserted between theends of the feed arm and the feed finger and securedtothe frame is provided with a horizontal slot 46 within which the endof the feed finger travels, and which limits the travel in a horizontalline. The adjusting screw 47 is mounted on the bar 18 andengag'es' a'threaded nut 48 on the bar 19. A bearing bar 48 is mounted on a slidingstandard 49 49 traveling in ways 5050 in the frame', and on a threadedbolt 51 travelings'inavertical way 52. This bolt is operated by'anut 53mounted thereon and seated on a shoulder 54 in the frame. An inwardlyflaring groove 55 is channeled in the bottomof-the' bar 49* and avertical bearing block 34- inserted therein and held in place by a setscrew 56. A bearin pin 43' is inserted in-an opening in the bloc 34 andsecured in placeb'ya set screw 45. At the top of the feedarm is anopening 21 in which is seated a'roll 22 and the boss 24 has an inwardlyprojecting-cylindrical portion 24 seated in the guide 45,- and the bar18 is held in place bya-tapered bolt 25 passing through the boss- 24 theprojection 24 and the roll 22 anel secured at-the end by nuts 33Referring now to the operation of the machine, power is supplied in anywell known manner through-the medium of the levers anel cams as, forinstance, that shown and described in Letters Patent No. 654,844, HenryP. Schofield, assignor to L. L. Filstrup With the saw in position tocommence operation-on the tooth, the feed pin 39 presses against thetooth immediately preceding.

As the guide wheel is carried down the front of the tooth, the feedfinger travels back, ridingover'the back of the tooth as shown in Fig.2. WVhen the grinding wheel has reached the throat of the tooth, thefeed pin engages the front of the next tooth near the top. The grindingwheel is raised and the feed pin pushes the saw along to bring the nexttooth in position to be operated on by the grindin wheel. T he grindingwheel follows along the top of the tooth as the feed pin pushes the sawalong bringing the next tooth to be operated on by the grinding wheel.hen the saw is being moved. forward, the bearing pin 43 slides on theblock 43 and the side of the bearing block 34 is closely braced againstthe side of the block which is rigidly secured in place on the top ofthe frame. The bars, block and feed pin are all preferably of hardenedsteel, and the wear on the ad justable parts iseasily compensated. Thebear ingpin, being preferably round, can, in the event of becomingflattened by sliding over the block, be turned slightly, forming anewpointof'contact, and the feed pin can be moved horizontallyin orderto bring a new point of contact with the tooth of the saw. The verticaladjustment of the bearing block makes it possible to bring the pressureagainst any desired point in the face of the tooth, and permits theaccommodation of the machine to different sizes of saws with the leastpossible readjustment of parts. The point of contact of the feed pinbeing vertically above the center of the bearing pin, almost perfecthorizontal travel is assured, and the feed pin maintains at all timesthe same vertical position with respect to the teeth, which point is ofthe utmost importance in machinery of this character, as any deviationbetween the relative )ositions of the teeth at different stages of t 1egrinding operation renders the work of the grinding wheel irregular andunsatisfactory, and makes the face of the saw teeth rough and jagged. Atthe same time, if there is a difference in the horizontal alinement,-there will be a corresponding difference between the height of thevarious teeth, and in the event that the apex of a tooth extends abovethose near it, the bulk of the work of the saw is thrown uponthat'tooth, rendering it more liable to become broken.

In my modification shown in Figs. 1 1, etc., the accuracy of thehorizontal travel of the feed finger is further assured, and the adjustment of the feed finger is simplified. The vertical adjustmentof thefeed pin and hearing pin is accomplished by raising or lowering theblock 48 by means of the nut 53, as shown in Fig. 11.

The different saw filers using devices of this character have differentideas with respect to the proper point at which the feed should engagethe tooth. Some require a machine in which the feed pin engages thetooth near its apex, while others prefer a machine in which theengagement is in the throat. My device is such that it may be adjustedvertically to meet the varying wants of the purchasers or users.

As shown in Fig. 20, the sharp corners or edges of the feed pin 39 areadapted to enga e in the swage under the front of the toot Thus thefeeding will be of a character to insure uniform grinding or facing offof the swa ed saw teeth. Both in Fig. 2 and in Fig. 11 t e feed pin andits mountingthe feed fingercan be maintained at any working level,according to the length and slope of the latter, and as may be founddesirable. In other words, the pin and its mountings can be reciprocatedin any one of a plurality of parallel lanes.

I c aim V 1. In a saw sharpening machine, a guide mounted on the frameof the machine, a reciprocable feed finger, an adjustable and re movablefeed pin seated in said feed finger, a spring clamping plate for saidfeed pin mounted on the upper side of said feed finger, a guide block,and screws for adjustably clamping said guide block to the under side ofthe feed finger, one of said screws passing throu h the clamp spring andserving to removably hold the same in place, and a lateral guide pincarried by the guide block at a point below the feed pin, for thepurpose set forth.

2. In a saw-sharpening machine, a feedfinger and means for reciprocatingit, said feed-finger having a transverse angular seat in its upper side,a feed-pin shaped in crosssection to fit down into said seat, aspringclamp-plate and means for clamping it down on the face of saidfeed-finger, the outer edge of said plate having a broad resilientbearing upon the upper face of the feedin and its inner edge eingprovided Wit a downwardly-turned flange bearing upon the face of thefeed-finger.

8. In a saw-sharpening machine, a suitable guide on the machine frame, areciprocable feed-finger carrying a laterally extending feedin, a guideblock, clamp screws securing t is guide block adjustably to the underside of said feed-finger, said guide block being vertically split at itsforward end and having a transverse hole extending through said splitportions, a bearing or su porting pin 43 eX- tending through said ho eand adapted to rest on the aforesaid guide on the machine frame, and aclam screw connecting the two members formed by the split, substantiallyas set forth.

Signed by me at Chicago, Cook Illinois this 6th day of Feb. 1906.

LARS LARSEN FILSTRUP.

Witnesses:

F. H. DRURY, ALBERT JOHN SAUsER.

county,

